The 4 channel Geovision surveillance DVR a comprehensive and powerful PC based DVR solution suitable for the areas where constant video and audio surveillance is critical, such as casinos, shopping malls, chain stores, gas stations, offices, banks and public utilities. CCTV Camera Pros builds, tests, certifies, supports, and provides warranty on all of our Geovision surveillance camera systems. Please allow us up to 5 days to customize and test your Geovision DVR before we ship it to you. All systems include a dedicated Surveillance Grade 500GB hard drive for video storage. The Windows 7 64 bit operating system is installed and preconfigured on a separate High-Capacity Solid State Drive. Geovision includes free mobile apps for iPhone, iPad, and Android devices.